Community R-Series Application Guide — Page 10
SYSTEM OPTIMIZATION
CHOOSING THE RIGHT LOUDSPEAKERS
AND ELECTRONICS
Choose R-Series models with high enough maximum SPL to provide the needed SPL at the farthest listener with an
appropriate headroom. Typical headroom factors are at least 6 dB for voice paging, at least 10 dB for voice reinforcement and
at least 20 dB for music reinforcement.
Choose R-Series models with the right frequency response for the application. Subwoofers will improve the sound quality of a
music reinforcement system but may reduce intelligibility in a voice-only system in a reverberant space.
Choose R-Series models with the right coverage patterns to cover the audience evenly. Point the loudspeakers at the
listeners and away from walls and ceilings or outdoor obstructions.
In outdoor applications, loudspeakers may be far enough apart to create artificial echos in areas of overlapped coverage.
Ideally, put all loudspeakers in a central location (central cluster design) or use a distributed system design to minimize this
problem. In any case, minimize overlap when loudspeakers are separated by more than approximately 40 feet.
Choose power amplifiers large enough to provide the desired power output with enough headroom to avoid clipping. Use a
limiter and high-pass filter to protect the loudspeakers. Follow proper wiring design and adjust gains and levels to minimize
hum and noise.
COMMISSIONING THE SYSTEM
Commissioning is the process of optimizing the performance of the system after it has been installed. There are several steps
in commissioning including verifying the proper operation of each system component and adjusting system gains and levels.
The last step in system commissioning is known as system equalization or “voicing.” Equalization is the process of adjusting
the frequency response of the system to optimize voice intelligibility or musical sound quality (or both). Note that R-Series
loudspeakers are factory voiced to optimize their speech intelligibility and musical sound quality. For this reason, many
designers find they can minimize overall system equalization and still achieve excellent voice intelligibility and musical sound
quality.
When equalizing an R-Series loudspeaker system the following points should be kept in mind to achieve the best results and to
avoid damaging the drivers.
1. Use only small amounts of equalization. In particular do not boost frequencies by more than about 3 dB. When
cutting frequencies more than 3 dB of attenuation is OK. Bear in mind that extreme frequency cuts will usually
result in less than optimum performance.
2. Do not attempt to boost any frequencies below 100 Hz with a graphic equalizer. Note that with the
recommended high-pass filter, moderate amounts of boost from a simple bass control are acceptable.
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